diff --git a/requirements.readthedocs..txt b/requirements.readthedocs..txt
index 5576e19..00d0e4e 100644
--- a/requirements.readthedocs..txt
+++ b/requirements.readthedocs..txt
@@ -1,2 +1,3 @@
 numpy
-scipy
\ No newline at end of file
+scipy
+numpydoc
\ No newline at end of file